The test report specifies the test pressure and how long it must be maintained for hydrostatic testing. If it does not, the test pressure must be at least _____ times the maximum design pressure of the installation.
a. one and one-half
b. two
c. two and one-half
d. three
a. one and one-half
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Needle valves are used for fine flow control because _____.
a. the shape provides a gradual increase or decrease in the size of the valve opening b. they are very inexpensive c. they are made of stainless steel d. they exhibit high head loss
The , or , is the first of the structural lumber used in framing the home:
A. mudsill B. base plate C. sill D. both a and b E. both b and c
?What could occur if system installers fail to compensate for roof sags?
A. ?The increased average weight of the system may cause the roof to fail. B. ?The drainback system will not operate. C. ?The system could have a steeper pitch than required. D. ?Low points are created where freezing water may occur.
Assume that a motor has known friction and windage losses described by the equation TFW = b?. Sketch the T -? characteristic of the motor if the load torque TL is constant, and the TL -? characteristic if the motor torque is constant. Assume that TFW at full speed is equal to 30 percent of the load torque.
Find: Sketch torque-speed curve